A good PDF compressor reduces file size without making text or images illegible. Here are the best free options tested in 2026.
1. FileCurve — Best for Privacy
Browser-based PDF compression. Your PDF never leaves your device. Free with no daily limits. Also handles merge, split, rotate, and add watermarks.
2. Smallpdf — Best Quality
Server-based with excellent compression using Ghostscript. Quality is very good. Free tier is limited to 2 tasks/day and requires signup. $9/month for full access.
3. iLovePDF — Best Free Tier
Good free tier (no daily limit, up to 100MB files). Requires signup. Uploads files to servers. Premium at $6/month removes ads and limits.
4. PDF2Go — Best Format Coverage
Compresses PDFs and converts between many formats. Free tier limits file size. Good quality output.
Compression Quality Comparison
Server-based tools (Smallpdf, iLovePDF) generally achieve better compression ratios because they use Ghostscript, a powerful PDF processing engine. Browser-based tools like FileCurve use pdf-lib which is excellent for merging, splitting, and basic compression, but may not match server-based tools for maximum compression of image-heavy PDFs.
Which Should You Use?
- ✓ Privacy-sensitive PDFs (contracts, medical records): FileCurve
- ✓ Maximum compression for image-heavy PDFs: Smallpdf or iLovePDF
- ✓ Frequent use, no signup: FileCurve